The initial osteotomy should be not exceeded 6 mm from the distal surface of the first molar (Fig.3: 5.92 mm).  The 2 mm pilot drill (D) penetrates the mesial slope of the socket (red line) for 3-4 mm.  There is 2.72 mm from IAN (yellow line: upper border of IAN canal).  If the implant is placed along the long axis of the tooth, the initial osteotomy should start at the apex of the socket.  The same pilot drill (black outline) penetrates the nascent bone for the same distance (3-4 mm) for primary stability, IAN may be invaded!

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Xin Wei, DDS, PhD, MS 1st edition 02/08/2013, last revision 03/04/2018